San Manuel, AZ: frost dates by year

Last spring and first fall frost at NOAA station USC00027530, 1954 to 2025, measured from daily minimum temperatures.

Elevation 3,420 ft, 32.601, -110.629. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 9	Nov 29
Earliest	Jan 4 (2015)	Oct 28 (1970)
Latest	Apr 22 (1957)	Dec 29 (2018)
Trend	6.0 days earlier per decade	3.0 days later per decade
Years with data	38	38, 3 with no freeze

At 28°F (hard freeze) the median last spring date is Feb 21 and the median first fall date is Dec 8.

The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.

Chart

Last spring frost (32°F)

First fall frost (32°F)

Dots are single years. The gray line is the median, the green line the fitted trend.

Year by year

Year	Last spring 32°F	First fall 32°F	Last spring 28°F	First fall 28°F
2025	Jan 31	no data	Jan 22	no data
2024	Feb 12	none	Jan 9	none
2023	Mar 3	none	Feb 16	none
2022	Mar 9	Dec 14	Jan 2	Dec 17
2021	Mar 17	none	none	none
2020	Feb 6	Dec 4	Feb 6	none
2019	Feb 24	Dec 17	Feb 23	Dec 17
2018	Mar 1	Dec 29	none	Dec 29
2017	Jan 29	Dec 8	Jan 28	Dec 22
2016	Feb 4	Nov 30	Feb 4	Dec 18
2015	Jan 4	Nov 29	Jan 3	Dec 16
2014	Jan 7	Nov 17	none	Dec 27
2013	Feb 26	Dec 6	Feb 21	none
2012	Mar 20	Dec 20	none	Dec 20
2011	no data	Dec 4	no data	Dec 6
1978	Feb 19	no data	Feb 17	no data
1977	Apr 4	Dec 20	Feb 28	none
1976	Apr 18	Nov 14	Mar 5	Nov 28
1975	Apr 8	Nov 19	Mar 31	Nov 30
1974	Mar 10	Dec 10	Feb 22	Dec 10
1973	Mar 29	Nov 21	Jan 24	Nov 24
1972	Feb 12	Nov 1	Feb 3	Dec 6
1971	Mar 4	Oct 30	Mar 3	Oct 30
1970	Mar 11	Oct 28	Jan 30	Dec 11
1969	Mar 16	Nov 20	Mar 15	Nov 20
1968	Apr 19	Nov 26	Jan 19	Dec 3
1967	Apr 13	Nov 30	Jan 10	Dec 2
1966	Mar 4	Nov 27	Mar 4	Dec 10
1965	Mar 5	Nov 29	Mar 5	Dec 19
1964	Mar 10	Nov 16	Mar 9	Nov 17
1963	Mar 19	Dec 11	Feb 14	Dec 13
1962	Mar 15	Dec 27	Mar 2	none
1961	Mar 1	Oct 29	Feb 24	Nov 15
1960	Feb 26	Nov 16	Feb 25	Nov 28
1959	Mar 12	Nov 29	Mar 6	Dec 27
1958	Apr 5	Nov 16	Mar 8	Nov 16
1957	Apr 22	Nov 18	Mar 23	Nov 23
1956	Apr 2	Nov 3	Feb 18	Nov 20
1955	Mar 22	Nov 16	Feb 23	none
1954	no data	Dec 13	no data	Dec 27

"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.